from flask_wtf import FlaskForm
from flask_wtf.file import FileField, FileAllowed
from flask_login import current_user
from wtforms import StringField, PasswordField, SubmitField, BooleanField
from wtforms.validators import DataRequired, Email, EqualTo, Length, ValidationError
from flaskBlog.models import User


class RegistrationForm(FlaskForm):
    username = StringField('Username', validators=[
                           DataRequired(), Length(min=2, max=20)])
    email = StringField('Email', validators=[DataRequired(), Email()])
    password = PasswordField('Password', validators=[DataRequired()])
    confirm_pwd = PasswordField('Confirm Password', validators=[
                                DataRequired(), EqualTo('password')])
    submit = SubmitField('Sign up')

    # 命名要求validate_field(self, field): 不需要调用
    def validate_username(self, username):
        user = User.query.filter_by(username=username.data).first()
        if user:
            raise ValidationError(
                'That username is taken, choose another one!')

    def validate_email(self, email):
        user = User.query.filter_by(email=email.data).first()
        if user:
            raise ValidationError('That email is taken, choose another one!')


class LoginForm(FlaskForm):
    email = StringField('Email', validators=[DataRequired(), Email()])
    password = PasswordField('Password', validators=[DataRequired()])
    remember = BooleanField('Remember Me')
    submit = SubmitField('Login')


class AccountForm(FlaskForm):
    username = StringField('Username', validators=[
                           DataRequired(), Length(min=2, max=20)])
    email = StringField('Email', validators=[DataRequired(), Email()])
    picture = FileField('Update Profile Picture', validators=[
                        FileAllowed(['jpg', 'png', 'gif'])])
    submit = SubmitField('Update')

    def validate_username(self, username):
        if username.data != current_user.username:
            user = User.query.filter_by(username=username.data).first()
            if user:
                raise ValidationError(
                    'That username is taken, choose another one!')

    def validate_email(self, email):
        if email.data != current_user.email:
            user = User.query.filter_by(email=email.data).first()
            if user:
                raise ValidationError(
                    'That email is taken, choose another one!')


class RequestResetForm(FlaskForm):
    email = StringField('Email', validators=[DataRequired(), Email()])
    submit = SubmitField('Request Password Reset')

    def validate_email(self, email):
        user = User.query.filter_by(email=email.data).first()
        if user is None:
            raise ValidationError(
                'There is no account with that email. You must register first.')


class ResetPasswordForm(FlaskForm):
    password = PasswordField('Password', validators=[DataRequired()])
    confirm_pwd = PasswordField('Confirm Password', validators=[
                                DataRequired(), EqualTo('password')])
    submit = SubmitField('Reset Password')
